HTTP関連

[プログラミング]
[Java]

GETメソッド

HTTPコネクションをはって，データを取得する．

import java.net.URL;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.io.*;

public class HttpGetTest {

  public HttpURLConnection connection;
  private String newline = System.getProperty("line.separator");

  public HttpGetTest(String url){

    try{
      URL u = new URL(url);
      connection = (HttpURLConnection)u.openConnection();
      connection.setRequestMethod("GET");
      HttpURLConnection.setFollowRedirects(false);
      connection.setInstanceFollowRedirects(false);
    }catch(MalformedURLException e){
      e.printStackTrace();
    } catch (ProtocolException e1) {
      e1.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  /**
   * 接続し，ウェブサイトからのレスポンスを読み込む
   */
  public void read(OutputStream out){
    try {
      connection.connect();
    } catch (IOException e) {
      e.printStackTrace();
    }
    try {
      byte[] buf = new byte[1024];
      int length = connection.getContentLength();
      DataInputStream in = new DataInputStream(connection.getInputStream());
      int len = 0;
      int sum = 0;
      System.out.println("length: " + length);
      System.out.print(" *");
      while((len = in.read(buf)) > 0){
	sum += len;
	if(sum > length/10){
	  System.out.print("*");
	  sum = 0;
	}
	out.write(buf, 0, len);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    connection.disconnect();
  }

  public static void main(String[] args) throws Exception{
    HttpGetTest http = new HttpGetTest(args[0]);
    StringWriter out = new StringWriter();
    String path = http.connection.getURL().getFile();
    int index = path.lastIndexOf('/');
    String file = path.substring(index+1);
    if(file.equals("")) file = "default.out";
    System.out.println("output => " + file);
    System.out.print(" ");
    http.read(new FileOutputStream(file));
    System.out.println();
    //System.out.println(http.connection.getContentType());
    //System.out.println(http.connection.getContentEncoding());
    //System.out.println(out);
  }
}